Improvement in wrewches



VAUGUSTUS S. BUNKER, LAWRENCE, ASSIGNOR OF ONE-HALF HIS RIGHT TOWOODBURY SANBORN, OF CHELSEA, MASSACHUSETTS.

IMPROVEMENT IN WRENCHES.

Specification forming part of Letters Patent No. 7,703, dated February27,1877 application tiled April 10, 1876.

To clL whom it may concern:

Be it known that I, AUGUs'rUs S. BUNKER, of Lawrence, in the county'ofEssex and Oommonwealth of Massachusetts. have invented an ImprovedWrench.

The object of my invention is to so construct a wrench by applying aspring to one of its sides that it will securely hold a nut when placedin the same, not allowing the same to fall or slip from the wrench.

' My invention is very convenient in removing nuts from theaxles of aWagon; and I do declare that the following is such a true, perfeet, andexact description thereof that others skilled in the art to which itappertain's can make and use the saine, reference being had to theaccompanying drawing, and to the letters of reference marked thereon,for a more complete description thereof.

The drawing represents an ordinary carriage-wrench having my inventionapplied thereto.

A represents a carriage-wrench, having a iat elliptic spring, B, rivetedto one of the working-faces of the wrench. The spring is preferablysecured by means of one or more oval rivets, thus eiectually preventingthe spring' from twisting or becoming displaced in the wrench.

To apply the wrench to a carriage-nut, the side provided with the springis placed in contact with the side of the nut, and then, by exertingslight lateral pressure, the ends of the spring are forced backwardlyuntil the wrenchhead slips over the nut. When the nut has been removedfrom the carriage or other structure, the free ends of the spring Bpress firmly against the side of the nut, and hold the latter securelybetween the spring and opposite side of the wrench-head.

'patent of J. Burt, No. 85,276, dated December 29,1868. In the Wrenchabove referred to one end of the springrests against the lower portionof the working-face of the movable jaw, While the opposite end of thespring is bent backwardly to slide on the nose of the jaw, therebycausing the nut to bear only on the apex of the spring.

In my improved wrench the spring is completelys protected by the head ofthe wrenchv against breakage or displacement', and, again,

the nut is rmly heldwithin the Wrench by the sharp ends of the spring,which serve to grasp the extreme ends f one edge ofthe nut and force thelatter` squarely against the opposite side of the wrench-head, therebypreventing any displacement ofthe nut from the wrench.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

'A carriage-wrench provided with a dat elliptic spring, secured at itsmiddle portion to one of the faces of the wrench-head, substantially'asand"for the purpose specified.

, A. S. BUNKER. iL. si Witnesses: Y

J osEPH L. BONNEY, GHAs. D. MOORE.

